FYI i'm back to 4.23 W (that's damn good, TLP still used) with Ubuntu
4.11 RC1 kernel (including APST commit by default).
APST is the key for my problem, since I reach PC8 (powertop) at the same time.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1664602
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My Dell BIOS is up-to-date. The IMEI firmware is included in Dell's BIOS
updates, there is no separate package.
I'll try to check IMEI version anyway.
PS : I do use NVMe drive, before that my Skylake Xeon 1535M was eating
very few watts (~4.5W), now it's ~8.2W ; I don't know what to think
about
@djao, sorry for the slow response. I hit pc8 briefly, but that's with
most everything tuned, and running nothing. Lots of applications seem
to be pretty power hungry for me. That's going to have to get tackled
by each upstream project before we integrate solutions into the distro.
@fthx.
I hit this exact bug running Zesty, kernel 4.9 or 4.10 (or 4.8...).
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https://bugs.launchpad.net/bugs/1579917
Title:
Skylake processor never reaches low power states on X1 Carbon gen 4
I applied the Intel IMEI update and now I can reach pc6 and pc7 pretty
consistently but never pc8, pc9, or pc10. Does this agree with your
observations? Using a T460s with NVMe and kernel 4.4.0-36-generic #55 on
16.04, no powertop tuning. All combinations of AC/battery and display
on/off were
Closing as invalid, as the root cause was clearly the IMEI firmware in
my case, and has since been verified.
** Changed in: linux (Ubuntu)
Status: Triaged => Invalid
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IMEI firmware update definitely appears to be the fix as it is now verified
independently.
https://bugzilla.kernel.org/show_bug.cgi?id=116591
** Bug watch added: Linux Kernel Bug Tracker #116591
http://bugzilla.kernel.org/show_bug.cgi?id=116591
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Sorry hit post too quickly.
Anyhow, so it looks like upgrading the IMEI firmware now allows my
amt/vpro capable laptop to reach low-power power pc-states.
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So I recently had to run a certain Microsoft OS while debugging another
issue. I ran a number updates during that session. The most important
of which was an IMEI firmware update. I can't prove for certain that
the IMEI firmware update resolved this issue, but it is the mostly
likely
Dave, this is interesting to read:
http://www.mouser.com/pdfdocs/4thgencorefamilydesktopvol1datasheet.pdf
Section 4.2.5, pages 54 through to 58. See the C2 package state, it
maybe that the package is not able to transition to C3 because of those
constraints.
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Thanks Dave, that data clearly shows that the CPUs are getting into the
deeper C states yet the processor package is indeed showing that it is
not going into a deep power state.
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sudo powerstat -Rag 1 480.
** Attachment added: "powerstat2.out"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579917/+attachment/4660277/+files/powerstat2.out
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Here's a screen cap of powertop. Notice that the package never reaches
any powerstate above pc2.
** Attachment added: "powertop.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579917/+attachment/4660278/+files/powertop.txt
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powerstat -za 1 480
When the machine from 7 -> 4 watts usage is roughly when the display
went to sleep.
** Attachment added: "powerstat.out"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579917/+attachment/4660276/+files/powerstat.out
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And also:
sudo powerstat -Rag 1 480
..and again paste the output into the bug report as an attachement.
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https://bugs.launchpad.net/bugs/1579917
Title:
Skylake processor never
Can you run:
powerstat -za 1 480
..and paste the output into the bug report as an attachment.
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https://bugs.launchpad.net/bugs/1579917
Title:
Skylake processor never reaches low
Per request. fwts cstates
** Attachment added: "results.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579917/+attachment/4660039/+files/results.log
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** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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https://bugs.launchpad.net/bugs/1579917
Title:
Skylake processor never reaches low power
I think it's unrelated, but in the off chance this is firmware related,
I have also tried the 1.14 version of Lenovo's bios with no improvement
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** Summary changed:
- Skylake processor with NVMe drive never reaches low power package states on
X1 Carbon gen 4
+ Skylake processor never reaches low power states on X1 Carbon gen 4 with NVMe
drive
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